/*******************************************************************************
 * Copyright 2010 DemandSpot
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/
package com.demandspot.aws.sqs;

import java.util.List;

import org.apache.log4j.Logger;

import com.xerox.amazonws.sqs2.Message;
import com.xerox.amazonws.sqs2.MessageQueue;
import com.xerox.amazonws.sqs2.SQSException;

public abstract class SqsBatchMessageHandler extends SqsMessageHandler {
	private static final int DEFAULT_BATCH_SIZE = 100;
	
	private MessageQueue messageQueue;
	int batchSize;
	
	public SqsBatchMessageHandler() {
		super();
		this.batchSize = DEFAULT_BATCH_SIZE;
	}
	
	public SqsBatchMessageHandler(int batchSize) {
		this();
		this.batchSize = batchSize;
	}

	public abstract void handleMessages(List<Message> messages);
	
	@Override
	public final Action handleMessage(Message message) {
		throw new UnsupportedOperationException("using handleMessages instead");
	}

	void setMessageQueue(MessageQueue messageQueue) {
		this.messageQueue = messageQueue;
	}

	public void setBatchSize(int batchSize) {
		this.batchSize = batchSize;
	}
	
	protected void deleteMessage(Message message) {
		try {
			messageQueue.deleteMessage(message);
		} catch (SQSException e) {
			Logger.getLogger(getClass()).warn("Failed to delete message " + message.getMessageId(), e);
		}
	}
}
